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Chapter 5 Settings for Interfaces and Network Services
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all local hosts by a single click.
5.6 HTTP cache
Using cache to access Web pages that are opened repeatedly reduces Internet traffic (in
case of line where traffic is counted, it is also remarkable that using of cache decreases
total volume of transferred data). Downloaded files are saved to the harddisk of the
WinRoute host so that it is not necessary to download them from the Web server again
later.
All objects are stored in cache for a certain time only (Time To Live — TTL). This time
defines whether checks for the most recent versions of the particular objects will be
performed upon a new request of the page. The required object will be found in cache
unless the TTL timeout has expired. If it has expired, a check for a new update of the
object will be performed. This ensures continuous update of objects that are stored in
the cache.
The cache can be used either for direct access or for access via the proxy server. If you
use direct access, the HTTP protocol inspector must be applied to the traffic. In the
default configuration of WinRoute, this condition is met for the HTTP protocol at the
default port 80 (for details, see chapters 6.3 and 12.3).
To set HTTP cache parameters go to the Cache tab in Configuration → Content Filtering
→ HTTP Policy.
Enable cache on transparent proxy
This option enables cache for HTTP traffic that uses the HTTP protocol inspector
(direct access to the Internet).
Enable cache on proxy server
Enables the cache for HTTP traffic via WinRoute’s proxy server (see chapter 5.5).
HTTP protocol TTL
Default time of object validity within the cache. This time is used when:
• TTL of a particular object is not defined (to define TTL use the URL specific
settings button —see below)
• TTL defined by the Web server is not accepted (the Use server supplied Time-To-
Live entry)
Cache directory
Directory that will be used to store downloaded objects. The cache file under the
directory where WinRoute is installed is used by default.
Warning: Changes in this entry will not be accepted unless the WinRoute Firewall
Engine is restarted. Old cache files in the original folder will be removed automati-
cally.